用数学归纳法证明1+a+a2+…+an+1=(n∈N,a≠1),在验证n=k成立时,左边所得

用数学归纳法证明1+a+a2+…+an+1=(n∈N,a≠1),在验证n=k成立时,左边所得的项为(    )

A.1                                          B.1+a+…+ak

C.1+a+…+ak+1                       D.1+a+…+ak+2

答案

C

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